Why did some dinosaurs grow so big?
Paleontologists don't know for certain, but perhaps a big
body size protected them from most predators, helped to
regulate interior body temperature, or let them reach fresh
sources of food (some possibly browsed treetops, as giraffes
do today). No modern animals except whales are even close
in size to the biggest dinosaurs;
therefore, paleontologists think that the dinosaurs
world was much dissimilar from the world today and that
climate and food supplies must have been favorable for reaching
great size.
